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当前位置: 首页 > 文章 > 外源一氧化氮对硝酸盐胁迫下黄瓜幼苗生长及抗氧化酶活性的影响 应用生态学报 2009,20 (12) 3009-3014
Position: Home > Articles > Effects of exogenous NO on the growth and antioxidant enzyme activities of cucumber seedlings under NO-3 stress Chinese Journal of Applied Ecology 2009,20 (12) 3009-3014

外源一氧化氮对硝酸盐胁迫下黄瓜幼苗生长及抗氧化酶活性的影响

作  者：
焦娟;王秀峰;杨凤娟;孙家正;魏珉;史庆华;王秀红
单  位：
山东农业大学园艺科学与工程学院
关键词：
硝普钠;NO3-胁迫;黄瓜幼苗;抗氧化酶;生长
摘  要：
采用营养液培养试验,通过添加不同浓度(0.05、0.1、0.2、0.3mmol·L-1)的硝普钠(SNP)作为NO供体,研究外源NO对NO3-胁迫下黄瓜幼苗生长及叶片抗氧化酶活性的影响.结果表明:140mmol·L-1NO3-胁迫下,外加0.1mmol·L-1SNP处理1d和7d后,黄瓜幼苗叶片中SOD、CAT和APX活性显著升高;MDA含量显著降低,可溶性蛋白含量增加,说明外加0.1mmol·L-1SNP增强了黄瓜幼苗对活性氧的清除能力,降低了膜脂过氧化程度,幼苗生长势增加,对高浓度NO3-胁迫的抗性增强;当SNP浓度达0.3mmol·L-1处理7d后,SOD、POD、CAT和APX活性均开始降低,MDA含量增加,黄瓜幼苗受害加重.外加一定浓度(0.1～0.2mmol·L-1)的外源NO可缓解NO3-胁迫对黄瓜幼苗的影响.
译  名：
Effects of exogenous NO on the growth and antioxidant enzyme activities of cucumber seedlings under NO-3 stress
作  者：
JIAO Juan1,WANG Xiu-feng1,2,YANG Feng-juan1,2,SUN Jia-zheng1,WEI Min1,2,SHI Qing-hua1,2,WANG Xiu-hong1 (1College of Horticulture Science and Engineering,Shandong Agricultural University,Tai'an 271018,Shandong,China; 2State Key Laboratory of Crop Biology,Tai'an 271018,Shandong,China)
关键词：
sodium nitroprusside; NO-3 stress; cucumber seedlings; antioxidant enzyme; growth.
摘  要：
In this study,cucumber seedlings were cultivated in nutrient solution added with different concentration (0.05,0.1,0.2,and 0.3 mmol·L-1) sodium nitroprusside (SNP) as nitric oxide (NO) donor to study the effects of exogenous NO on the growth of cucumber seedlings and the activities of antioxidant enzymes in cucumber leaves under NO-3 stress. Under the stress of 140 mmol·L-1 NO-3,treating with 0.1 mmol·L-1 of SNP for 1 d or 7 d increased the leaf soluble protein content and superoxidase (SOD),catalase (CAT),and ascorbic acid peroxidase (APX) activities,and decreased the leaf malondialdehyde (MDA) content significantly,suggesting that exogenous NO could enhance the capacity of cucumber seedlings in scavenging active oxygen species,protect the seedlings from the peroxidation of membrane lipids,and promote the seedlings growth and increase their resistance to high concentration NO-3 stress. After the cucumber seedlings grew in 0.3 mmol·L-1 of SNP for 7 d,the activities of leaf SOD,POD,and CAT decreased,and the MDA content increased,resulting in the injury of cucumber seedlings. It was indicated that certain concentration (0.1-0.2 mmol·L-1) exogenous NO could alleviate the NO-3 stress to cucumber seedlings.

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